Hi There!
I see that the cookbook is offline? 
Anyone knows when it’s back online? I am trying to learn cakephp but I can’t read documentation right now
Hi!
Yes the cookbook is currently offline - I’ve let the core team know. It should be back soon - in the meantime checkout https://book.cakephp.org/3.next/en/index.html 
Megan
CakePHP Community manager
Hi,
Until the cookbook is back up you can use a copy in the internet archive: https://web.archive.org/web/20190406000512/https://book.cakephp.org/3.0/en/index.html
If you rather want to use an offline pdf version, you can use this link: